Phys102Final-141Zero Version
Coordinator: M.FaizMonday, January 05, 2015Page: 1
Q1.
The displacement of a vibrating string versus position along the string is shown in Figure 1. The speed of the wave is 10 cm/s. What is the phase difference between the points A and Bon the string?
Fig#
A)π radians
B)π/2 radians
C) radians
D)3π/4 radians
E)2π radians
Q2.
You were using an instrument to measure the sound level of a point source located at a distance R1. When you moved away from the sourceto a distanceR2 the sound level decreasedby 20 dB. Find the ratio R2/R1.
A)10
B)100
C)1000
D)2
E)5
Q3.
An ideal gas can expand from state I to sate F along three possible paths, as indicated in Figure 2. The work (in kJ) done by the gas along the paths IAF, IF, and IBF, respectively are:
Fig#
A)8, 5, 2
B)8, 5, 8
C)2, 2, 2
D)6, 3, 0
E)8, 6, 2
Q4.
A gas mixture consists of two different gases, A and B with molar masses MA = 2.0 g/mol and MB = 32 g/mol. Find the ratio of their rms speeds VA-rms/VB-rms.
A)4.0
B)16
C)0.25
D)12
E)1.0
Q5.
For many solids at very low temperatures (T), the molar specific heat c = AT3, where the constant A depends on the material. For aluminum, A = 3105 J.mole1.K4. Find the change in entropy for 3 moles of aluminum when its temperature is decreased from 8 to 5 K.
A)– 0.01 J/K
B)– 0.02 J/K
C)+ 0.02 J/K
D)+ 0.03 J/K
E)– 0.03 J/K
Q6.
Three charged particles are fixed on an x-axis as follows: Q1 at x = 2.0 cm, Q2 at
x = 0.50 cm, and Q3 at x = 2.0 cm. If the net electrostatic force on Q2 is zero, find the ratio Q1/Q3.
A)2.8
B)0.36
C)1.0
D)0.60
E)1.7
Q7.
In Figure 3, the electric field lines on the left have twice the separation of those on the right. If the magnitude of the electric field at A is 40 N/C, what is the magnitude of the electric field at B?
Fig#
A)20 N/C
B)40 N/C
C)80 N/C
D)10 N/C
E)30 N/C
Q8.
Figure 4 shows a cube of side length 4.0 cm placed in a non-uniform electric field given by N/C. What is the electric flux through the rear face (that lie in the xy-plane) of the cube?
Fig#
A)Zero
B)4.8103 Nm2/C
C)6.4103 Nm2/C
D)8.0103 Nm2/C
E)1.1102 Nm2/C
Q9.
Three charged particles are placed as follows: 16 pC at (0, 0), 11 pC at (4.0 cm, 0), and 11 pC at (0, 4.0 cm). Determine the electric potential at the mid-point on the line connecting the +11 pC and −11 pC charges. Assume V = 0 at infinity.
A)5.1 V
B)12 V
C)6.4 V
D)+12 V
E)+5.1 V
Q10.
A 100 pF capacitor is charged to a potential difference of 50 V, and the charging battery is disconnected. The capacitor is then connected across a second (initially uncharged) capacitor. If the potential difference across the 1st capacitor drops to 40 V, what is the capacitance of the 2nd capacitor?
A)25 pF
B)43 pF
C)50 pF
D)12 pF
E)67 pF
Q11.
A wire with a resistance of 6.0 is stretched so that its new length is twice its original length. Determine the resistance of the stretched wire, taking into consideration that the density and resistivity of the material are unchanged.
A)24
B)6.0
C)3.0
D)12
E)1.5
Q12.
A circuit with an ideal battery and one resistor of resistance R carries a current of 6 A. When an additional resistance of 2Ωis inserted in series with R, the current drops to 4 A. DetermineR.
A)4 Ω
B)0.5 Ω
C)8 Ω
D)1 Ω
E)2 Ω
Q13.
In Figure 5,C= 5.0F, and I= 3.0A when the capacitor is fully charged. Find the charge on the capacitor.
Fig#
A)75 C
B)60 C
C)15 C
D)25 C
E)12 C
Q14.
In Figure 6, R1= 100Ω,R2=R3=R4=75Ω, and the ideal battery has emf ε= 6.0 V. What is the current in R1?
Fig#
A)48 mA
B)24 mA
C)34 mA
D)60 mA
E)18 mA
Q15.
In Figure 7, R2 = 200Ω,R3=400Ω, and the power dissipated in R3 is 100 W. What is the current in R1?
Fig#
A)1.5 A
B)0.50 A
C)0.75 A
D)1.0 A
E)0.25 A
Q16.
Applying Kirchhoff’s rule to loop L in Figure 8 (with ideal batteries) results in the following equation:
Fig#
A)3I2– I1 + 1 = 0
B)3I2–I1 + 8 = 0
C)3I2– I1 – 8 = 0
D)3I2+ I1 + 1 = 0
E)3I2– I1 – 1 = 0
Q17.
Four current-carrying coils (1, 2, 3, and 4) with given magnetic dipole moments (in mJ/T) of, , , and are placed in a uniform magnetic field . Rank the coils according to their potential (orientation) energies, greatest first.
A)2, then 3 and 4 tie, 1
B)1, 3, 2, 4
C)3 and 4 tie, then 1 and 2 tie
D)1, 2, 3, 4
E)1 and 2 tie, then 3 and 4 tie
Q18.
A charge q travels along a straight line in a region of uniform magnetic and electric fields at constant velocity of. If the magnetic field , find the electric field (in N/C).
A)
B)
C)
D)
E)
Q19.
An electron (e) and a proton (p) are moving in circular paths with the same speed in a plane that is perpendicular to a uniform magnetic field. What is the ratio of their periods, Te/Tp?
A)5.5104
B)1.810
C)2.3104
D)1.310
E)1.0
Q20.
A 1.0 m long wire lying along an x-axis carries a current of 2.0 A in the positive x direction. The wire is in a uniform magnetic field of. What is the magnetic force on the wire?
A)
B)
C)
D)
E)
Q21.
Figure 9 shows a 20-turn rectangular coil of dimensions 10 cm by 5 cm. It is hinged along one long side (z-axis), and carries acurrent i = 0.1 A. A uniform magnetic field of is present in the region. What is the torque acting on the coil about the hinge line?
Fig#
C)
D)
E)
Q22.
Figure 10 shows three arrangements in which long parallel wires carry equal currents directly into or out of the page at the corners ofidentical squares. Rank the arrangements according to the magnitudeof the net magnetic field at the center of the square, greatest first.
Fig#
A)2, 3, 1
B)1, 3,2
C)3,then 1 and 2 tie
D)1 and 2 tie, 3
E)3, 2, 1
Q23.
In Figure 11, a closed loop carries a current i = 0.40 A. The loop consists of two straight wires and two concentric circular arcs of radii R1 = 4.0 m and R2 = 8.0 m. What is the magnetic field at the center P?
Fig#
A)1.6×108 T, into the page
B)1.6×108 T, out of the page
C)4.8×108 T, into the page
D)4.8×108 T, out of the page
E)3.2×108 T, into the page
Q24.
Two long parallel wires, separated by a distance of 5.0 cm, carry currents in the same direction. If I1 = 5.0 A and I2= 8.0 A, the magnitude of the force per unit length exerted on each wire by the other is:
A)1.6×104 N/m
B)3.2×104 N/m
C)Zero
D)8.0×104 N/m
E)8.0×106 N/m
Q25.
A solenoid is 95 cm long and has a diameter of 4.0 cm and 1200 turns. It carries a current of 3.6 A. The magnitude of the magnetic field inside the solenoid at a distance 1.5 cm from its center is:
A)5.7 mT
B)2.8 mT
C)4.3mT
D)1.4mT
E)8.9mT
Q26.
A long wire carrying 50 A is perpendicular to the magnetic field lines of a uniform magnetic field of magnitude 2.5 mT. The net magnetic field at a point is zero. Find the distance of the point from the wire.
A)4.0×103 m
B)2.0×103 m
C)8.0×103 m
D)1.6×103 m
E)6.3×103 m
Q27.
A conducting loop is moving into a uniform magnetic field, which is directly out of the page as shown in Figure 12. What are the directions of the induced electric current when it is entering and leaving the field, respectively?
Fig#
A)Clockwise, Counterclockwise
B)Clockwise , Clockwise
C)Counterclockwise, Counterclockwise
D)Counterclockwise, Clockwise
E)Induced current is zero in both cases
Q28.
A conducting loop of radius 12 cm is located in a uniform magnetic field that changesin magnitude as given in Figure 13. The loop’s plane is perpendicular tothe magnetic field. What emf is induced in the loop during the time interval 4.0 s to 6.0 s?
Fig#
A)+2.310 V
B)2.3102 V
C)+1.0 V
D)1.0 V
E)+8.5 V
Q29.
In Figure 14, a 240-turn coil of radius 1.8 cm and resistance5.3 Ω is coaxial with a solenoid of 220 turns/cm and radius1.6 cm. The solenoid currentdrops from 3.0 A to zero at a steady rate in 50 ms.What current isinduced in the coil during this timeinterval?
Fig#
A)6.0102 A
B)2.5104 A
C)2.5106 A
D)Zero
E)6.0105 A
Q30.
A conducting bar of 10.0 cm length and negligible resistance slides along horizontal, parallel, frictionless conducting rails connected to a resistor R = 2.00 Ω as shown in Figure 15. A uniform magnetic field B = 3.00 T is present perpendicular to the plane of the paper. What should be the speed of the bar such that the power dissipated in the resistor is 8.50 W?
Fig#
A)13.7 m/s
B)18.9 m/s
C)25.5 m/s
D)2.55 m/s
E)5.10 m/s
King Fahd University of Petroleum and Minerals
Physics Departmentc-20-n-30-s-0-e-1-fg-1-fo-0